Syncing a catalogue you do not own
Tens of thousands of products from a third-party supplier, continuously synchronised. The bugs here are not in the fetch, they are in the clock.
tail -f ~/notes
Writing
Concepts from the proof, explained in my own words with code from my own systems.
Escrow is not a boolean
Holding money between two parties looks like a status field. It is a balance, a state machine, and a transaction boundary you have to draw narrowly on purpose.